Cathode Based on Molybdenum Disulfide Nanoflakes for Lithium–Oxygen Batteries

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• 作者：Mohammad Asadi ; Bijandra Kumar ; Cong Liu ; Patrick Phillips ; Poya Yasaei ; Amirhossein Behranginia ; Peter Zapol ; Robert F. Klie ; Larry A. Curtiss ; Amin Salehi-Khojin
• 刊名：ACS Nano
• 出版年：2016
• 出版时间：February 23, 2016
• 年：2016
• 卷：10
• 期：2
• 页码：2167-2175
• 全文大小：585K
• ISSN：1936-086X

文摘

Lithium–oxygen (Li–O₂) batteries have been recognized as an emerging technology for energy storage systems owing to their high theoretical specific energy. One challenge is to find an electrolyte/cathode system that is efficient, stable, and cost-effective. We present such a system based on molybdenum disulfide (MoS₂) nanoflakes combined with an ionic liquid (IL) that work together as an effective cocatalyst for discharge and charge in a Li–O₂ battery. Cyclic voltammetry results show superior catalytic performance for this cocatalyst for both oxygen reduction and evolution reactions compared to Au and Pt catalysts. It also performs remarkably well in the Li–O₂ battery system with 85% round-trip efficiency and reversibility up to 50 cycles. Density functional calculations provide a mechanistic understanding of the MoS₂ nanoflakes/IL system. The cocatalyst reported in this work could open the way for exploiting the unique properties of ionic liquids in Li–air batteries in combination with nanostructured MoS₂ as a cathode material.